Reading down to the comments, there is an unattributed reference to "the $485 wood knob, yes KNOB, to reduce vibration that might be experienced with the original plastic knob." Who knows if that is true, but I can believe it...
I was recording tracks from some old DATs into my computer recently, and compared the sound of a digital transfer compared to analogue via a gold plated £10 phono lead. Of course the digital method would be preserving every bit, and the analogue way would just further degrade the audio and lose information, right? Guess which sound I preferred.
EDIT! Thanks to anonymous comment, here is the knob in question! The description is awesome. I was going to quote a sentence or two, but it's all pretty hilarious and far beyond parody.